Jaw exercise device



FIG. 1 is an isometric view of a jaw exercise device showing our new design;

FIG. 2 is another isometric view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof showing my design. 

CLAIM The ornamental design for a jaw exercise device, as shown and described. 